05-16-1994 Planning Packet - Laserfiche WebLink

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n Jse an ion Zoning File IIW4 Mav 9, 1994 Page 2 of 3 ■ i. u « rtf thf C\tv of Orono Planning Commission members should be C^o. 0.., . e„.orc a,, reac., plain resulatinns TTk Watershed Distnet also reviews and issues permits tor anv aetivits involves the alteration of the flossi plain of Uke Minnetonka. The Citv has reviewed the applieants' plan of mitigation proposing the eveavation of sme hi) cub c “ei to the south or street side of the propeny. The proposal involves the some 6 0 eubic fe vh'v 3S'area. To qualifv for n.xd plain storage, the excavation ot y * » " Mow ,he 9M v elevation and above the 9:9.4' OHWL o “uke MinMonka.''Is Gustafson s comments note (Exhibii II). the toul e.xcavatmn would 1 -1 iU*nth as credit would onlv bccin once you rc3ch the 931.5result in a retention pond at a 2 dtpin as creaii wuuiu um. _ j elevation Gustafson recommends a shallow trench or swale be excavated out to the lake along the side prlferablv the west side of the propeny as ihe east side contains more mature plamtng_ He notes that, based on the review of mpographic intormation. excavations within this the oropertv would be located within the flotxl plain and qualify. 1 he drainage swa c wou a so nmLe^ositive drainage from the residence. In fact during the Planning Commission s review of this application (review F.xhibit D), applicants advised that it was their plan to c.eate swales to carrv runoff to the lake. In funher discussions with Gustatson. appheants should provide addit.onal grading and drainage plans with the ^ ^ Sinr^miit confinning the location and width of the swale noting that swale need not go any funher“sLth from the lake than to the low retention area adjacent to residence and that spot elevations be shown within swale confirming positive drainage to »ake. Once again, miiiga lo credit can only be gained by excavations between the 929.4’ and 931.5 elevations. The MCWD has also asked that the regulatory ntx>d protection elevation ^ set at 9_3T5* rather than 932.5’ as required per Orono Municipal Ordinance Section 10^55. Subdivision / (B). The Watershed District requires 2’ above the flood plain elevation at 93 . Staff Recommendation To approve the conditional use permit and variance tor Eric and Shelly would allow the filling and compensatory mitigation of 625 cubic feet within the P Lake Minnetonka, based on the following findings: 1. Proposed improvements will not increase the runoff on the property. 2. The required swale will provide positi\e drainage on the property. 3. A permanent residence has existed on the propeny for over 50 years.